test: Wait for kube-apiserver to come up
test: Wait for kube-apiserver to come up

Repeatedly try to connect to its port in order to verify this.

Hack around this issue:

https://github.com/GoogleCloudPlatform/kubernetes/issues/8311

Closes #2289
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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